How to add an input tag to product selection

[seowebmaster]

Hello, 

I need my product to have the following characteristics:

• Colors: can be used attributes - does not affect price - Shown as colors
• Width: can be used attributes since there are a limited quantity - affects price - Shown as dropdown list
• Height: cannot be used attributes because they can be almost infinite - does not affect price - shown as input type 

I know that there is the customization part, but the text imputs appear on a separated tab (why?) and they are textAreas.

I need all the selection to be at the same place.

In case this cannot be done natively, you can suggest any module, which cannot be too heavy because I need it only for simple selection and input (no conditial logic).

Ps. I am using Prestashop 1.6

Thank you in advance